Product Short Description: The determination of sulfite usually is made only on boiler waters or on waters that have been treated with catalyzed sodium sulfite for corrosion prevention. Product Description: Sulphite (Sulfite) Test Kit indicator TK - 15 is a part of RXSOL-62-5503-001. This refil pack is very economical and available on 50% discount for our exhisting ustomer. Role of TK - 15 during sulfite test procedure ::: Add TK - 15 ::: RXSOL-62-5503-004 Reagent dropwise, swirling and counting after each drop, until color changes from colorless to a faint but permanent blue. Always hold bottle in vertical position. This color change is taken as the endpoint. Record the ml of TK - 15 ::: RXSOL-62-5503-004 solution used. Calculation of Results FORMULA: ppm sulfite as SO3 = ml of TK - 15 ::: RXSOL-62-5503-004 x 500 / ml SAMPLE Using a 50 ml sample, sulfite, in parts per million as SO3 is equal to the ml of TK - 15 ::: RXSOL-62-5503-004 required multiplied by 10. RXSOL-62-5503-001 is complete set to DETERMINE Sulfite label in feed Water. Dose of Sulfite can be controlled by this method ::: Because it readily reacts with oxygen to form sulfate, sulfite is not usually found in natural water systems. In its most common form, sodium sulfite, it is widely used as an oxygen scavenger in feedwater conditioning to prevent pitting in boilers; as a pulping or pulp-bleaching agent by the paper industry; to neutralize residual chlorine in potable water, sewage, industrial effluents, and textile process waters; and as a reducing agent in still other manufacturing processes. Sample water over 100°F will cause a false-high reading; therefore, quickly cool to room temperature before testing. To prevent a false-low reading caused by the reaction between sulfite and ambient air or dissolved oxygen, water samples should be capped while cooling and then tested without delay. An iodometric drop test is the most popular field method for determining sodium sulfite concentrations. Reagent packs, containing an instruction and chemicals only, may be purchased for use with buret setups. Note: Sulfide and ferrous iron cause positive interference; copper and nitrite cause negative interference.